Machinist s tool



, planes.

NiTED STATES `armer @Erica FRED I. GETTIAND FREDERICK DICKISON, OF GENEVA, OHIO.

MAcHlNisTs T ooL..

SPECIFICATION forming part of Letters 'Patent' No. 293,647', dated February 19, l1881i.

Application lcd lTune 7, 1883. (No model.)

Tov all whom tmc/,y concern:

' Be it known that we, FRED I. GETTY andA FREDERICK DIoxINsoN, both of Geneva, county of Ashtabula, and State of Ohio, have invented new and useful Improvements in Machinists Tools, of which the following is a specification, reference being had to the accompanying drawings.

The invention relates to the class of handtools known as parallels or parallel The object of our invention is to provide a simple, strong, easily-operatedtool by which a piece of material may be accurately moved any desired distance within the range ofthe device. 1 l

The invention consists in combining two wedge shaped pieces in such manner that when together their opposite sides are parallel, and in providing a means for holding and adjusting the parts; and, iinally, it'consists in the general 'construction and arrangement whereby the objects of our invention are attained. v

In the accompanying drawings, in which similar letters of reference indicate like parts, Figure 1 is a plan, and Fig. 2 an end view, of the device. Fig. 3 is a side view of the same with a portion broken away, disclosing the interior mechanism. Figs. 4 and 5 are views, on an enlarged scale, of apart of the adjusting mechanism; and Fig. 6V is a side view of the device as ordinarily used.

This class of tool is used largely on planers, lathes, Src.

Heretofore it has been necessary,when raising a piece of work to a stated height upon a planer-table, to wedge or block -it-up and measure the distance with a scale. With our device the use of the scale may be dispensed the piece a and thetop of the piece b 'are par'- j, this wheel will revolve with allel. In the bottom of the dovetail groove is a rack, r, extending the'whole length of the piece a. The piece b is provided with a spur or gear wheel, j, the teeth of which mesh with the rack-teeth. If, now, the spur be revolved, the relative position of the parts a and b will be changed; or, in other words, the piece b will be caused to move on the' part a. either up or down, the incline depending on the direction of revolution, and the top will be moved to or from the base, the degree of variation being easily readable upon the side.

Upon the same pivot with the spur-wheelj is a worm-gear, i, having a part, k, fitting within a recess in the spur-wheel adapted to receive it. The worm-gear t' and pivotZ are threaded, so that if the pivot be turned in one direction the worm -gear will be drawn toward and locked to the spur wheel. The stem 7L is threaded, as shown, and meshes with the worm-gear, so that by turning the burr-wheel g on the stem 71., the worm-gear i is caused to revolve, and if it be locked to the spur-wheel it, and move the part b on the part a. l

If it is desired to quickly move the parts a considerable distance, the wormgear is released from the spur by turning the pivot t', when the spur kwill Arevolve freely, and the parts may be easily moved approximately to the desired point,when the wheels are locked, as before describedfand the tool accurately adjusted by turning the stem'h.

It will readily be seen that although We deem a dovetail connection between the parts a and b the most desirable, yet this is not essential to the construction of the device.

The pieces c and d aresecured in place by screws, the piece d being equal in length and secured to the part a. Thus a device is pro vided for accurate outside and inside measurement. y The tool is generally used, howA ever, without these pieces.

By supplying pieces e of various thickness, any outside measurement may be obtained from 0 to the maximum thickness of the parallel.

The side f the tool is marked, as shown, in two or more scales. For instance, the portion a of the part a (see Fig. 3) may be marked in divisions of sixty-fourths, the part ai in hun- Q acacia drcdths, and the part b in divisions in the met- 2. In a machinists tool, the inclined piece ric system, using different points as the unit in each case. The distance of variation from the unit-point will be indicated upon the respective scales, each indicating the same distance by different standards. It will readily be seen that various standards may thus be combined and used on the same instrument at the same time, and that the utmost accuracy is attainable, as the rapidity of variation of the top and base is small as compared to the variance indicated upon thc scale.

XVe are aware of United States Letters Iatent for improvements in hanging saws,77 dated December 2T, 1864, No. 45,677, and of Letters Patent for i1np1o.e1nents in joiners7 gages,77 dated March S, 1861, No. 41,867, and make no claim to the devices therein shown.

rIlhe proportion `of the parts may of course be varied andthe detail of construction greatly modified without departing `from our invention. IVe do not, therefore, confine ourselves to the particular construction illustrated.

Having therefore described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. A maehinists tool consisting ot' the combination of the parts a and b, having the inclined sides, as shown, one having a groove, and one provided with a tongue adapted to iit within the groove, and a means to hold and adjust the parts, substantially as and for the purposes shown..

a, provided with a rack, in combination with a piece, I), having a spur-wheel adapted to mesh with the rack, and a means t0 turn the spur-wheel, substantially1 as shown.

3. A tool consisting 01 wedge-shaped pieces having a means to hold them in position, in combination with pieces c and cZ, whereby both outside and inside measurement may be made, substantially as shown.

it. A tool consisting 0f two pieces, wedgcshaped in the direction of their length, as shown, having a means to hold them in position, and provided with a graduated scale whereby variance is indicated, substantially as shown.

5. In a machinists tool, the combination of a piece, (l, having a rack, withpiece b, having stem l1, worm-gear fi, spurj, and pivot l, substantially as shown.

G. A machinists tool consisting of the two parts t and b, having inclined sides, and having two or more series of graduations marked thereon, and a means to adjust and hold the parts in position, substantially as shown.

FRED I. GETTY. FREDERICK DICKINSON. Yv'itnesses to F. I. Getty:

ALLEX VEnsTnn, J. W'. Ilnnsnv. \\'itnesses to F. Dickinson:

HENRY Mniixs, l. W. la'riloi-zn. 

